The problem being addressed is the efficient querying of events in a timeline without loading the entire dataset or relying on external indexes like Lucene for sorting. A multilevel tree approach, where domain nodes are attached to index tree leafs and queries are traversed through this structure, is proposed as a solution. This allows for the retrieval of specific event ranges by finding common paths and collecting events ordered via relationships, which can be expressed in a single Cypher query that returns event names ordered by name.